Aragorn grants Drúadan Forest to the Drúedain (estimated date)

Without haste and at peace they passed into Anórien, and they came to the Grey Wood under Amon Dîn; and there they heard a sound as of drums beating in the hills, though no living thing could be seen. Then Aragorn let the trumpets be blown; and heralds cried:

'Behold the King Elessar is come! The Forest of Drúadan he gives to Ghân-buri-Ghân and to his folk, to be their own for ever; and hereafter let no man enter it without their leave!'

Then the drums rolled loudly, and were silent.

The Return of the King, LoTR Book 6, Ch 5, Many Partings

A longer version of this scene exists in an earlier draft of this chapter:

[They] came to the Grey Wood under Amon Dîn. And there beside the road in the shadow of the trees stood Ghan of the Wild Woods and two of his headmen beside him, and they were clad all in garments of green leaves to do honour to the king. For Ghân-buri-Ghân said: 'He was great king; he drove away dark with bright iron. And now men of Stonehouses have king, he will not let dark come back.' And he and his headmen laid their foreheads upon Aragorn's feet; and he bade them rise up, and he blessed them, and gave them the Forest of Drúadan to be their own, so that no man should ever enter it without their leave. Then they bowed and vanished into the trees.

Sauron Defeated — The End of the Third Age, HoME Vol 9, Ch 7, Many Partings